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How Forests Influence Local Rainfall
为什么森林能影响局地降水
精读先不看文字，完整听一遍。
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Trees release huge amounts of water vapor daily through transpiration—up to 1000 liters per large tree.树木通过蒸腾作用每天释放大量水蒸气，一棵大树最多可达1000升。
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This moisture rises, cools, and condenses into clouds, especially over dense tropical forests like the Amazon.这些水汽上升、冷却并凝结成云，尤其在亚马逊等茂密热带雨林上空。
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Forest canopies also create rough surfaces that slow winds and encourage air to rise, enhancing cloud formation.森林冠层还形成粗糙表面，减缓风速，促使空气抬升，从而促进云的形成。
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Biogenic volatile organic compounds—released by leaves—form tiny particles that serve as cloud condensation nuclei.叶片释放的生物源挥发性有机化合物可形成微小颗粒，作为云凝结核。
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Deforestation reduces evapotranspiration and disrupts local circulation, sometimes cutting rainfall by 20–30% within decades.毁林会减少蒸散发，扰乱局地环流，有时数十年内使降雨量减少20%–30%。
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Satellite data shows ‘flying rivers’—atmospheric moisture streams—that originate in forests and supply rain far inland.卫星数据显示，源自森林的‘空中河流’——大气水汽输送带——可为内陆遥远地区带来降雨。
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Mountain forests are especially effective because terrain lifts moist air, triggering orographic precipitation.山地森林尤为有效，因地形抬升湿润空气，触发地形雨。
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Urban planners now protect watersheds with native trees not just for soil, but to sustain reliable rainfall patterns.城市规划者如今保护流域内的原生林，不仅为固土，更为了维持稳定的降雨模式。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Mountain forests are especially effective because terrain lifts moist air, triggering orographic precipitation. 山地森林尤为有效，因地形抬升湿润空气，触发地形雨。
- Biogenic volatile organic compounds—released by leaves—form tiny particles that serve as cloud condensation nuclei. 叶片释放的生物源挥发性有机化合物可形成微小颗粒，作为云凝结核。
- Deforestation reduces evapotranspiration and disrupts local circulation, sometimes cutting rainfall by 20–30% within decades. 毁林会减少蒸散发，扰乱局地环流，有时数十年内使降雨量减少20%–30%。
④ 懂 · 选一选
⑤ 今天会说这一句
Mountain forests are especially effective because terrain lifts moist air, triggering orographic precipitation.
⑥ 跟读并录音
Mountain forests are especially effective because terrain lifts moist air, triggering orographic precipitation.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Mountain forests are especially effective because terrain lifts moist air, triggering orographic precipitation.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。